发光学报Issue(7)：769-774,6.DOI:10.3788/fgxb20153607.0769
基于Er3+：YAlO3/TiO2的可见光催化降解室内甲醛
Photocatalytic Degradation of Indoor Formaldehyde by Er3+:YAlO3/TiO2 Photocatalyst Under Visible Light Irradiation
摘要
Abstract
In order to develop the photocatalytic activity of TiO2 under visible light as that under ultra-violet light to degrade indoor ormaldehyde pollution, a visible light response photocatalyst consisting of TiO2 and upconversion luminescence agent Er3+∶YAlO3 was prepared using hydrothermal treatment method. The photocatalyst was characterized by X-ray diffractometer (XRD) , UV-Vis diffuse reflec-tance spectrophotometer (DRS) and fluorescence spectrometer (FS) . The prepared TiO2 is anatase-dominant. Er3+∶YAlO3 can convert visible light to ultraviolet ( UV) light to expand the absorption range of TiO2 . The upconverted UV light can excite TiO2 effectively to produce active materials with strong oxidation ability. The photocatalyst was applied to degrade gaseous formaldehyde in the sealed reactor, and the effect of initial formaldehyde concentration and photocatalyst dosage on the degrada-tion efficiency of formaldehyde were investigated. The results show that the prepared photocatalyst can efficiently degrade the formaldehyde. The apparent first order reaction rate constant for gaseous formal-dehyde degradation is positively correlated with the initial formaldehyde concentration, but increases first then decreases with the increasing of photocatalyst dosage from 0. 061 2 g/L to 0. 234 8 g/L. When the formaldehyde concentration is 0. 058 mg/m3 and the photocatalyst dosage is 0. 122 4 g/L, the apparent first order reaction rate constant is the biggest of 3. 65 × 10-3 min-1 . The degradation fol-lows Langmuir-Hinshelwood model, and the reaction rate constant is 5 × 10-8 mg/( L·min) .关键词
上转换发光剂/TiO2/可见光催化/甲醛Key words
upconversion luminescence agent/TiO2/visible light driven photocatalytic/formaldehyde分类
数理科学引用本文复制引用
周娴,董山山,董双石,刘耀辉,万立东..基于Er3+：YAlO3/TiO2的可见光催化降解室内甲醛[J].发光学报,2015,(7):769-774,6.基金项目
国家自然科学基金(50908096) （50908096）
吉林省科技发展计划(20140101159JC)资助项目 （20140101159JC）
